Utami, Sri Rahayu, Retno Suntari, Christanti Agustina, and Novalia Kusumarini. 2019. “Improving Nutrient Availability in Pyroclastic Materials from Mount Kelud Using Organic and Inorganic Amendment”. Journal of Degraded and Mining Lands Management 7 (1). Malang, Indonesia:1987-93. https://doi.org/10.15243/jdmlm.2019.071.1987.